Grinding



L. R. HEIM Oct. 22, 1929.

GRINDING Original Filed Oct. 22. 1923 2 Sheets-Sheet INVENTOR ZW /f/w BVMWM ATTORNEY lllllllbl IIT lll L. R. HEIM Oct. 22, 1929.

GRINDING original Filed oct. 22,v 1923 2 Sheets-Sheet www@ Ilmumli" INVENTOR WH/m.,

Patented Oct. 22, 1929 UNITED STATES PATENT oEEicE LEWIS` B. HEIM,- OF DANBUBY, CONNECTICUT, ASSIGNOB, BY MESNE ASSIGNMENTS,

T CINCINNATI GRINDEBS INCORPORATED, QF CINCINNATI, OHIO, Av CORPORA- TION 0F OHIO GBINDING Application led October 22, 1923, Serial No. 669,899. Renewed Iarch 12, 1929.

This invention relates to grinding and more particularly to the art and apparatus for grinding articles or bodies having a round or circular cross-section. t

One of the objects of this invention is to provide apparatus for grinding bodies of round section that will be of simple and reliable action and of thoroughly practical, as well as rugged, construction. Another object is to provide apparatus of the above'nature that will be of wide range of use and f action and well adapted to meet not only the conditions of hard practical use, but also the varying and various requirements met with in practise. Another object of this invention is to provide grinding apparatus of the above nature capable of a high degree of uniformity as well as accuracy in its action and capable also of high speed of production of ground articles without impairment of either accuracy or uniformity in result. Another object also is to provide a simple and thoroughly practial art of grinding articles of round section which may be inexpensively carried on with accuracy and dependability of result. Other objects will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the features of construction, combinations of elements, arrangements of parts and in the several steps and relation and order of each of the saine to one or more of the others all as will be illustratively described herein, and the scope of the application of which will be in-` dicated in the following claims.

In the accompanying drawings, in which is shown one of various possible embodiments of the mechanical features of this invention,

Figure 1 is a plan View of the inding apparatus, certain parts being bro en away to show certain features of construction more clearly,

Figure 2 is a rear view-of the apparatus as seen from the bottom of Figure 1;

Figure 3l is a fragmentary sectional view as seen on the line 3-3 of Figure 2;

Figure 4 is a fragmentary sectional view of a portion .of the reci rocating mechanism for reciprocating one o the wheels;

50 Figure 5 is a fragmentary view, partly in section, as seen along the line 5-5 of Figure 2;

Figure 6 is a fragmentary view partly in sectioi as seen along the line 6-6 of Figure 2; an

Figure 7 is a fragmentary elevation as seen along the line 7-7 of Figure 2,

Figure 8 is a side elevation of a work carrier, and more particularly is a fragmentary view as seen along the line 8 8 of Flgure 1,

Figure 9 is a diagrammatic view in plan illustrating the action ofthe apparatus on articles of tapered form.

Figure 10 is a diagrammatic end view illustrating certain relations of-the wheels and l work supporting device.

Similar reference characters refer to similar parts throughout the several views of the drawings.

Referring now to the drawings and more l particularly to Figures 1 and 2, there is shown at 10 a main supporting frame of any suitable construction and hei ht, the frame 10 being shown broken away 1n Figure 2V at its lower portion and supported upon the upper part 7l of the main frame 10 for slidable movement one toward the other, are the carriages 11 and 12, one adjacent each end of .the main frame 10. The frame 10 is rovided with suitable airs of ways 13 and)14 extending l longitudinally thereof for guiding the carriages 11 and 12 respectively lengthwise of the -frame 10. At the adjacent ends of the carriages 11 and 12 are provided airs of transversely spaced bearings'l an 16 rel spectively adapted to rotatably support the shafts 17 and 18 res ctively. The shaft 17 is provided with an e ongated ulley 19 intermediate the bearings 15 an has mounted upon one over-han ing end thereof a grindi ing wheel 22. In Figure 1 the grinding wheel 22 is shown over-hanging the carriage 11 at the front side of the machine. The grinding wheel 22 is driven at a suitable grinding 'speed by means of a belt indicated in Figure I 1 at 21, which makes connection with any suitable-'source of power and preferably to'a pulley or other source of power within the main frame 10.

Upon one end of the shaft 18 is mounted what will bel hereinafter termed a regulating wheel 24, which wheel conveniently and preferably is made of a. suitable abrasive material. The regulating wheel 24 is driven by means of a belt 20 running over the pulley 26 mounted u n the shaft 18 and intermediate of the bearlngs ,16. The belt 2O is connected to any suitable source of power, preferably to a pulley or other source housed within the main frame 10.

The grinding wheel 22 and the regulating wheel 24 are rotated by means of their respective pulleys at speeds which are respectively high and low and inthe directions indicated bythe arrows in' both Figures 1 and 2. The grinding wheel is thus made to present an operative surface traveling downwardly at high speed withrespect to a' work carrier 28 interposed between the two wheels and to be more clearly hereinafter` described, and the regulating wheel 24 is thus made to present an 'operative surface which travels upwardly at a low speed with respect `to the carrier 28V. Preferably the regulating wheel 24, here shown as having a peripheral operative surface, is so related with respect to the work supporting surface ,of the carrier 28 that there exists between the path of travel of the operative surface of the regulating wheel 24 and the path of movement of the work along the carrier 28 an inclination which is effective to tend to urge the work along the carrier in the ,direction ofthe arrow 28l in Figure 1. This relative inclination is preferably obtained by inclining the axis of rotation of the regulating wheel 24 in the vertical lane and may conveniently be brought about' y making the bearin 16 adjacent the regulating wheel 24 of hig er elevation than the bearing 16 remote 'from the regulating wheel 24. In this manner, the axis of the regulating wheel' 24 is tilted out of the horizontal plane, and it may here be noted that a tilting of t'wo or three degrees is effective to bring about a component or thrust on the part of the regulating wheel surface in the direction of the arrow 28a with respect tothe carrier 28. The regulating wheel 24 thus not only controls the rotation of the work on the carrier 28. but preferably also is effective to urge the work lengthwise of the carrier and in the directionof the arrow 28. This action will be made clearer hereinafter. v

The above described relation between the regulating wheel 24, where the latter is operative by way of its peripheral surface, and the work carrier 28, is diagrammatically shown in Figure 10 in which the regulating wheel 24, the grinding wheel 22, and the work carrier 28 are diagrammatically shown as they would be seen as viewed from the righthand end of Figure 1.

The wheels 22 and 24 are substantially enclosed in a protective casing 29 suitably Sement of the wheels as will be more clearly hereinafter described. This protective casing 29 is formed so as to provide a vbridge portion 29a at a point substantially interme-y diate of the two wheels and below their adjacent operative surfaces. This bridge portion 29 is more clearly shown in Figure 8 of the drawings and-it will be seen that it provides a substantially horizontally extending supporting surfaceupon which rests a frame member 30 (see Figures 1, 2 and 8) detachably held in place as by downwardly extending plate 31 and the cap screws 31 passing therethrough and into the outer wall of the casing 29. The framemember 30 will be seen to extend between the two wheels and is formed to provide two vertically extending posts 30a and 30", one on each side of the two wheels. These two spaced posts 30a and 30" support a work carrier 28 as by means of the bolts 30 and 30d, the posts 30aL and 30b being slotted vertically (see Figures 2 and 8) to permitthe making of a vertical adjustment of the carrier 28 with 'respect to the operative surfaces of the wheels.

It will be noted,`however, that the carrier 28, in being thus supported adjacent its ends, may-have its respective ends adjusted vertically independently of one another. Thus the carrier 28 may be given any desired degree of inclination with respect to the horizontal which may be demanded by the conditions of operation, and an example of which wfiill be more particularly pointed out hereina er. v

As will be seen in Figure 2, the carrier 28 is preferably formed so that work positioned upon it, as indicated at 32, -may partake of free lateral movement with respect to the carrier 28 itself; thus I prefer to give the carrier 28 substantially the form of a bar the upper surface 28, upon which the work rests, is inclined toward the operative surface of the regulating wheel 24. Thus vwork or articles of cylindrical form may be supplied successively or in succession to the carrier 28 for action thereon by the wheels. The regulating wheel 24, the path of travel of the oper# ative surface of which is inclined with respect to the path of travel of the work along the carrier 28, will not only control the rotation of the work on the carrier 28, but also arrow 28, all during the grinding action thereon by the grinding wheel 22.- The inclined surface28 of the carrier 28 acts in effect to form a trough with the operative surface of the regulating wheel 24, thus not only insuring the retention of the work on the carrier, but also tending to make more effective the control of the rotation of the work 32 by the regulating wheel 24.

feed the work along in the direction of the The above action takes place where the work operated upon is cylindrical throughout; it may hence be continuously or in succession vfed 'along the carrier by the regulatingwheel 24. 1When, however, it is desired to grind to a desired and uniform diameter work or articles which have a projecting irregularity at one end of the cylindrical portion thereof such as a bolt, for eX- ample, the work, of course, cannot be fed continuously through the apparatus. The

work carrier 28, as hereinbefore described,

is thus cut away or recessed at'its front end or right hand end as viewed in Figure 8 as at 28g so that the work 32. shown in Figure 8 as taking the form of a bolt, may have its headed or enlarged end accommodated in the recess of the carrier 28.

The carrier 28 has mounted upon it adjacent its rear end as Viewed in Figure 1 or adjacent its left hand end as viewed in Figure 8, a stop member for limiting the movement of the work lengthwise of the carrier or in the direc-tion of the arrow 28a of Figure 1. This stop member may conveniently take the form of a relatively long screw 28b (see Figure 8) extending longitudinally of the carrier 28 and in threaded engagement with a boss 28c detachably secured to the carrier 28 in any suitable manner. The stop member thus formed by the screw 28" may be moved lengthwise of itself so that its right hand end, against which the work 32 abuts, may be adjustably positioned at will. A lock nut 281 may conveniently be employed to lock the screw 28b in its adjusted position.

As shown in Figure 8, the stop screw 28b limits the inner movement of the work 32 along the carrier 28 in a direction toward the left, the feeding component or thrust of the regulating wheel '24 in the direction of the arrow 28, and as hereinbefore clearly described, being effective to hold the work 32 securely against the stop. The grinding wheel 22 may thus perform the desired grinding action upon the cylindrical portion of the bolt 32 the stop preventing the entry of the head portion thereof between the two wheels.

Referring now to Figure 1, it may be seen that the regulating wheel 2-1 preferably of the type having a peripheral operative surface, has a broad operative face active adjacent the carrier 28. The regulating wheel 24 thus presents a controlling surface which is of suflicient expanse or extent lengthwise of the carrier 28 to effectively back up and support and control either a plurality of cylindrical articles arranged successively upon the carrier 28, as first hereinbefore set forth, or headed stock or work. such as bolts, of varying lengths when placed upon the carrier with the stop 28b in position, as secondt ly hereinbefore set forth, during the grinding action of the grinding wheel 22. The latter, however, as will be seen in Figure 1 has an operative surface the width of which is materially less than the width of the surface of the regulating wheel. At this oint it may be noted that for accuracy an uniformity in output of the apparatus, the wheels 22 and 24 must be trued periodically as by turning them down by means of a diamond, for example. One of the dominant aims of this invention is to provide a grinding apparatus in which the frequency of truing of the wheels will be vreduced and in which a more uniform or equalized wear takes place in the wheels. The grinding wheel, traveling at the grinding speed and operating generally on hardened steel objects, is sub]ected to the greater wear, but non-uniformly in that its reatest wear takes place at that portion of The operative surface adjacent vthat end of the carrier from which the work enters the grip of the wheels.

Referring still to Figure 1, it will be seen that the shaft 17 of the grinding wheel 22' over-hangs the carriage 11 at the rear side of the apparatus and it may be noted that this shaft and the bearings 15 in which it is rotatably supported are so arranged that the shaft 17 with the wheel 22 may be given a movement in an axial direction with respect to the fixed bearings 15 on the carriage 11. Thus it will be noted that the driving pulley 19 on the shaft 17 is a broad faced pulley so that as the shaft 17 is moved upwardly as viewed in Figure 1 the driving connection through t-he belt 21 'may be maintained throughout a material range of movement. The grinding wheel 22 may thus conveniently be given a movement lengthwise of the carrier 28. Preferably this movement is a reciprocatory movement and, where the work operated upon is cylindrical, and the work carrier 28 therefore arranged horizontally (or without inclination with respect to the pat-h of travel of the surface of the grinding wheel) this movement of the grinding wheel 22 takes place in a direction substantially coincident with the tangent line of contact of the work on the carrier 28 with the grinding Wheel 22. Thus, before describing in detail the mechanism for bringing about the movement of the grinding wheel, it may be noted that the grinding wheel 22 is reciprocated or moved lengthwise of the carrier 28 as the regulating wheel 24 rotates and feeds the work on the carrier, where the work takes the form of cylindrical articles such as rolls for roller bearings, or as the work is rotated and held against the stop 28b by the regulating Wheel 24 where the work takes the form of headed stock, such as the bolt 32 of Figure'8. As the grinding wheel 22 is reciprocated, it will be seen that first one end of its operative surface and then the other end begins the suitably formed to grinding or cutting action, and thus uniformity of wear throughout the extent of the operative surface of the wheel is maintained. The grinding wheel 22 advantageously takes the form of a cylindrical wheel having, thus, a peripheral operative surface, since its reciprocating movement relative to the Work on the carrier may be more simply effected by bringing about a movement of the shaft 17 of the wheel 22 relative to the supporting bearings thereof.

Considering now the mechanism for conveying to the inding wheel 22 this movement, and re erring more particularly to Figure 2, as well as to Figure 1, it will be seen that upon the one end of the shaft 18 upon which the regulating wheel 24 is supported, there is mounted a helical gear 33, which meshes with a helical gear 34 mounted upon a shaft 35 extending transversely of the regulating wheel shaft 18 and rotatably supported upon the rear side of the carriage 12. Thus the carriage 12 has mounted upon its rear side the spaced brackets 36 and 37 rovide the bearings 38 and 39 respectively fbr rotatably supporting the shaft 35. At the left hand end of shaft 35, as viewed in both Figures 1 and 2, and preferably to the left of the helical gear 34 is mounted a gear 40 adapted to mesh with A, and drive a gear 41 rigidly mounted upon a shaft 42 rotatably supported in the bearing 43 conveniently formed in the bracket 36. The gears 42 and 41 may be proportioned one to another so as to obtain any desired speed ratio of the shaft 42 to the shaft 35, and as illustratively shown in Figure 2, the gears 42 and 41 bear such a relation to one another that the shaft 42 is driven at twice the speed of the shaft 35. In order to insure adequate support for the shaft 42, the left hand end thereof is supported in a bearing l 44 formed in a bracket 45 and conveniently secured to the rear side of the main frame 10. At the right hand end of the shaft 42, the

latter carries a crank disk 46 (see Figures 2,

5 and 6) which is formed to provide a T-slot 47 extending centrally and transversely thereof. The T-slot 47 accommodates the head 48a of a bolt 48, the outer or right hand end of which as seen in Figure 2, supports rotatably a roller 49. By this construction, as reference to Figure 6 will clearly show, the roller 49, forming in effect a crank-pin, may be adjustably positioned along the T-'slot-47, to vary at will the distance of the roller 49 from the center of the crank disk 46 and hence to vary at will the throw of the crank-pin 49.

The bracket 36 is formed `to provide also two aligned and spaced bearings 50 and 51 in which is supported for oscillation therein a shaft 52 extending lon itudinally of the main frame 10 at the rear t ereof and toward the grinding wheel end of the apparatus. The left hand end of the shaft 52, referring still to Figure 2, is supported in the spaced bearings 53 and 54 formed in the lower end of a bracket 55 secured in any convenient manner, as by bolts, to the rear side of the inding wheel carriage 11 (see also Figurer tweenthe spaced bearings 53 and 54 of the bracket 55 there is mounted upon the shaft 52 an upwardly7 extending arm 56, a key 57 locking the parts together so that whatever movement of the shaft 52 about its axis takes place is also conveyed to the arm 56. The ey 57, however, coacts with a keyway 52* extending lengthwise of the shaft 52, so that the operative relation above described between the shaft 52 and the arm 56 may be maintained irrespective of whatever relative movement may take place between these parts in the direction of the axis of the shaft 52. Referring now to Figures 7 and 2, it will be. noted that the rear end of the grinding wheel shaft 17 is reduced in section at its extreme end as at 17a and upon this reduced end 17i is positioned a yoke 58 having a downwardly extended arm 58a connected to the upper end of the arm 56 through the link 59. The yoke 58 is relatively loosely mounted upon the reduced portion 17a of the shaft 17 so as to permit free rotation of the latter therein, but is held against axial movement relative to the shaft 17 by means of a collar 60 rigidly secured to the extreme end of the shaft. A thrust bearing 61 of any suitable construction is interposed between the yoke 58 and the collar 60 and another thrust bearing 62 is interposed between the yoke 58 and the main portion of the shaft 17. By this construction, the shaft 17 may freely rotate with respect to the yoke 58 and it will be seen (see Figure 7) that an oscillation of the shaft 52 will, through the arm 56 and the link 59, move the shaft 17 and hence the grinding Wheel 22 in an axial direction, the thrust bearings 61 and 62 acting to eliminate friction between the parts as well as to avoid binding therebetween.

The shaft 52 is swung about its axis to move the vgrinding wheel lengthwise of the work support 28 by means ofthe crank-pin or roller 49 hereinbefore described. The mechanism with which the crank-pin 49 coacts is conveniently and preferably mounted between the spaced bearings 5() and A51 and at the righthand end of the shaft 52 (see Figure` 2). This mechanism comprises preferably a crank arm 63 (see Figures 2, 4 and 5) sleeved at its lower end as at 63'L to permit locking of the arm 63 to the shaft 52 as by means of the pins 52b for exam le and to provide also an outer bearing sur ace for the lower end 64' of an upwardly extending arm 64, the upper and left hand face of which is provided withy a longitudinally extending slot 64b within which the roller or crank-pin 49 engages. Thus, as the shaft 42 rotates the crank disk 46, the member 64 is made to oscillate about the axis of the shaft 52, and if the member 64 is locked to the arm 63 (see Figure 4), the oscillating movement of the member 64 is communicated to the shaft 52 and hence to the grinding wheel 22 through the arm 63. Thus in Figure 4 is shown a clamping screw for locking these members together.

Assuming that the member 64is locked to the arm 63, the grinding wheel 22 will be reciprocated lengthwise of the carrier 28 throughout a stroke, the extent of which may be adjusted by adjustably positioning the follower or crank-pin 49 with respect to the crank disk 46. The regulating wheel 24, rotating at a materially slower speed than the grinding wheel 22, which latter wheel must be rotated at a suicient speed toproduce grinding action, thus forms a-convenient and relatively low speed source of power or producing the traversing movement of the grind- 'ing wheel with respect to the operative surface of the regulating wheel 24. As the grinding wheel 22 is thus reciprocated, it will be noted that its motion` throughout a given stroke is substantially simple harmonic in nature. This is advantageous inasmuch as the grinding wheel is thus given a greater speed of movement throughout substantially the middle part of its stroke and a lesser speed of travel at the ends of the stroke. Substantial uniformity of grinding action is thus assured, since the lesser portion of the grinding wheel effective on the work at the ends of the stroke is given more time to act upon the work.

Under certain conditions of operation, it may be desirable to bring the grinding Wheel to a pause or to a position of momentary rest at the ends of its stroke, in order to compensate for the impossibilit of reciprocating or moving the grinding wieel completely past the end of the work operated upon. This is particularly true where the work takes the form of headed stock, assumed hereinabove b way of example as the bolt 32 (see Figure 8). In order therefore to permit the above- `mentioned action to take place, the clamping screw 65, (which as seen in Figure 4 is threaded into the member 64) passes through an arcuate slot 63b in the arm 63 (see Figure 5). Hence, if the screw 65 is loosened sufficiently to unclamp the members 63 and 64, the resultant lost motion connection between the members 63 and 64 is eective to bring about a pause at the end of each oscillating movement of the arm 63 with the shaft 52. The drm 56 (see Figure 7 moving in unison with the shaft 52, will likewise be halted at the end of each oscillation with a resultant like action at the end of each stroke of the grinding wheel 22. The shortening of the stroke of the grinding wheel 22 resulting from the lost motion connection; between the members 63 and 64.may be compensated for, if necessary, or brought back to the desired extent by adjusting the crank-pin 49 relative to the crank disk 46 (see Figure 6). f

In order that the length of the pause at the end of the stroke of the grinding wheel may be adjusted, the length of the slot 63b is made adjustable by means of the two oppositely mounted adjusting screws 63c and 63" threaded into the opposite ends of the arm 63 and having their end portions extending into the respective ends of the slot 63". Thus the amount of lost motion between the members 63 and 64 and hence the length of the interval of rest of the grinding wheel 22 may be adjusted at will.

It is to be noted that not only is the length of the stroke of the grinding wheel 22 lengthwise of the carrier 28 made adjustable so that it may be made commensurate with the length of the work, such as the bolt 32, operated upon, but also the position of the range of movement of the grinding wheel 22 may be exactly predetermined. Thus, the parts 63 and 64 (see Figures 4 and 5) may be clamped together in any desired relation of angular displacement therebetween, the locus of op'- eration of the grinding wheel 22 being thus, for a given stroke, fixedly and exactly predetermined relative to the carrier or the work thereon. This same predetermination ot' the locus of operation of the grinding wheel 22 may becmade also wherethe lost mot-ion connection .between the arm 63 and the crank operated member 64 is utilized, since it will be seen that, by reason of the adjusting screws 63c and 63, the effective 'slot 63b may in effect be not only lengthened or shortened, but also displaced with respect to the arm 63. It will thus be seen that the movement of the grinding wheel 22 may be accurately and precisely predetermined to meet the particular character or nature of the work operated upon.

At this point it ma be noted that the grinding Wheel 22 may lie adjused toward or away from the carrier 28 (or the regulating wheel 24) for the purpose, for example, of adjusting the apparatus for operation upon work of different diameters. A hand-wheel 66.(see vFigure 1) operates a sleeve 67 which 1s 1n threaded engagement with the carriage 11 and is conveniently employed for adjustably positioning the carriage 11 with its associated grindin wheel 22 along the ways 13. As hereinbe ore described and as particularly shown in Figure 2, it will be noted that, beca-use of the splined connection between the shaft 52 and the grinding wheel moving arm 56, the grinding wheel may be given the desired reciprocating movements irrespective of its adjustment along the ways 13 with respect to the remaining parts of the apparatus. l

As hereinbefore pointed out, the Work. if of substantially uniform diameter or cylindrical throughout, may be supplied to the carrier and fed successively by the action of the regulating wheel 24 through lthe apparatus. Where the work, however, is of non-uniform diameter, as for example when it takes the form of headed stock such as the Abolt 32, a stop member such as the member 28b (see Figure 8) mu'st be em loyed to prevent the entry between the whee s of the `enlarged or headed portion of the work. The work in the latter case must therefore be positioned between the wheels or fed thereto for action thereon and thereafter removed from the grip of the wheels at the conclusion of the grlnding action thereon by the grinding Wheel 22.

Considering now t e manner in which work of the latter .character is positioned on the carrier for action thereon by the wheels and thereafter removed therefrom, it will be noted, turning nowA to Figures 2 and 1, that the shaft 35 has splined thereon and intermediate of the bearings 38 and 39 a cylindrical cam 68 which, by reason of the splined connection to the shaft 35, indicated at 35a fee also Figure 3) rotates with the shaft 35, ut may slide with respect thereto. The cam 6 8 has a cam groove therein with which 1s adapted to coact a sta-tionary roller or follower member 69 supported in the u per end of van arm 70 secured to the main rame 10 in a manner to be hereinafter more clearly described. The cam groove of the cam 68 is shaped to provide a major portion 68a which, 'with respect to the axis of rotation of the cam 68, lies substantially in a plane transverse to this axis, and a minor portion 68b which is dis lacedto the left (as viewed' in Figure 2) o the plane of the ma]or portion 68a. The cam groove 68"-68b is of-uniform width throughout so as to snugly receive the stationary follower or roller member 69, and it will thus be seen that, as the cam 68 rotates, the follower 69 will hold the cam 68 in fixed position throughout the coaction of the cam groove 68 therewith, but will cause a movement to the right and a subsequent return movement to the left to take place during its coaction with the portion 6 8b of the cam groove.

The shaft 35 is threaded throughout a substantial portion thereof intermediate `the bearings 38 and 39 as is clearly shown in Figures 1 and 2. The cam 68 may be rigidly positioned, if desired, at any desired point alon the shaft 35 by means of the nuts 71 and 2, one on each side of the cam 68 and in threaded engagement with the shaft 35. As shown in Figures 1 and 2, the nuts 71 and 72 lock the cam 68 rigidly against any slidable movement thereof along the shaft 35 hence, as the cam 68 is rotated and displaced as hereinabove described the shaft 35 together with the carriage 12 and the regulating/wheel 24 is similarl displaced with respect to the stationary follower member 69. The right hand end of the shaft 35 has rigidly mounted thereon the collars 35D and 35 between which and the bearing 39 are interposed the thrust bearings 7 3 and 74, in order that whatever thrusts inan axial direction of the Shaft 35. take place may be effectively transmitted to, and taken up by, the carriage 12 to move the latter with the shaft` 35.

Thus, assuming that the roller 69 is in coaction with the portion 68b of the cam 68, the regulating wheel 24 is in withdrawn position with respect to the grinding wheel 22, so that the work 32 may be positioned on the carrier 28 (see Figure 8) and substantially against the stop member 28". As the regulatinigt wheel 24 completes its movement to the le as viewed in Figures 1 or 2, the work 32, placed in rotation by the regulating wheel 24 1s moved by the latter upwardly on the inclined supporting surface 28e of the carrier 28 (see Figure 2) against the grinding wheel soA 22 for grinding action thereon. By this action the work is in effect gradually placed into coacting relation to the grinding wheel 22 for the commencement'of the grinding, it being noted that the inclinedr supporting surface of the carrier is effective to insure the maintenance of contact of the work with the regulating wheel and the avoidance of contact thereof with the grinding wheel as the regulating wheel approaches its position of rest.

The portion 682L of the cam 68 is effective to hold positively the regulating wheel 24 1n this position of rest throughout the entire perlod of coaction of this portion 68a with the .followers 69. While the regulating wheel 24 1s thus held in its position of rest, the reciprocation of the grinding wheel 22 as hereinbefore described takes place, it being noted that the number of complete cycles or reciprocat1ons of the grinding wheel22 may be made to depend upon the ratio of the gears 40 and 41 (see Figure 2). This ratio is illustratively shown as 2 to 1; hence the grinding wheel 22 commences and substantially completes .four strokes lengthwise of the carrier 28 during the coaction of the stationary follower 69 with the portion 68a of the groove of the cam 68. As the portion 68b of the cam groove comes into coaction with the follower 69 the grinding wheel 22 willbe substantially completing one of its strokes, ormay have'come to a pause at the end of one of its strokes, and the carriage 12 with the regulating wheel 24 is withdrawn from the grinding wheel 12o 22 and hence moved to the right. As soon as this movement begins, the work 32 is released from the grip of the two wheels, and it will be noted that the inclined surface 28 of the carrier 28 is effective to urge the work toward the regulating wheel 24, thus keeping it out of contact with the grinding wheel 22. y

Preferably the extent of the withdrawing movement of the carriage 12 is such that the regulating wheel 24 opens up a sufficient gap between itself and the carrier 28 to permit the work 32 tovroll olf of the carrier 28 and be thus discharged without manual handling from the apparatus. In this connection it might be noted that the inclined surface 28 ofthe carrier 28 urges the work in effect to follow the regulating wheel 24 and also that the peripheral form of the regulating wheel 24 provides ample space below and adjacent the carrier 28 to accommodate the falllng or discharging work.

As the carriage 12 is moved to the left and returned to its initial position vof rest, a new piece of work 32 may be placed upon the carrier 28, it being noted that the grinding wheel is either about to commence another stroke of movement or is still at rest during a pause at the end of a preceding stroke, depending upon the adjustment made as hereinbefore described.. The operation is thereupon repeated.

It will be understood that the cam groove in the cam 68 is preferably shaped so as to provide a suiliciently great withdrawing movement of the regulating wheel 24to effect the release of the work from the grip of the wheels.V It will be understood, however, that under certain conditions it may be desirable to make this movement of such an extent as to permit the work 32 .to drop between the wheel 24 and the work carrier 28. In order is sleeved as at al so as to receive the stud 75, and the sleeved portion 7 0* is slotted asat 70b in order that the sleeved portion 7 0 may be clamped not only -adjustably with respect to the stud 75, but also with any desired degree of ressure as by the olampin screw 70 (see also Figure 3). Thus, shoul the resistance to movement of the carriage 12 exceed a predetermined extent (dependent upon the pressure with which the sleeved portion 70n is clamped) for any reason, the connection between the stud and the arm 70 may yield to permit the otherwise vstationary roller member 69 to'be moved in response to the cam 68, thus relieving the driving mechanism from tending to overcome the excessive load imposed thereon by the Leal"- riage 12. Such action asabove described may take place ffor example where a work piece may become lodged or positioned, by accident or otherwise, between the carrier 28 and the regulating wheel 24, as will be clearly understood by reference to Figure 2.

By means of the connection between theA arm 70 and the stud 75 as hereinabove de-y scribed, the locus of operative movement of the carriage 12 and hence of the regulating wheel 24 may be predetermined at will. Thus for example, the arm 70 may be variously p0- sitioned about its pivotal supporting stud 75 to change the relation of the roller 69 with respect to the fixed part of the apparatus or main frame 10. This adjustment may be made use of in connection with the Hand control or adjustment of the position of the reg-A ulatin wheel to be more clearly hereinafter descri ed, in order to accommodate the apparatus for different diameters of work operated upon. Preferably, however, and as hereinbefore briefly mentioned, the position of the cam 68 along the shaft 35, and hence relative to the carriage 12, is adjusted for this vpurpose by means of the nuts 71 and 72 one on each side of the am 68.

The extent of the Awithdrawal movement of the regulating wheel 24 may be adjusted by backing the nut 72 away from the right hand end of the cam 68 to the desired degree. In Figures 1 and 2, the nut 72 is shown spaced from the cam 69 in the dotted line position 72 as illustrative of such an adjustment. With the nut 72 thus backed away from the cam 68, the subsequent movement of the cam 68 in response to the coaction of the follower 69 with the portion 68b of the cam groove is first a relative movement' with respect to the shaft 35 (and hence with respect to the car# riage 12) until the gap between the cam 68 and the nut 72 is taken up; thence follows the movement of the carriage 12 with the regulating wheel 24 to the right throughout the remainder of the throw of the cam groove. This adjustment is preferably utilized merely to release the work 32 from the grip of the wheels so that the work may be manually or otherwise removed from the carrier and re. placed by the next piece of work'to be operated upon.

The return movement of the carriage 12 to its normal operative'position follows after the gap between the cam 68 and the collar 71 is closed by the first portion of the return movement of the cam 68. The work isy thus placed in active operative relation to the two wheels, the vreciprocatin movement of the grinding wheel taking p ace as hereinbefore described, whereupon the withdrawal of the lregulating wheel 24 and the subsequent oper- .carriage 12. 'The withdrawing movement of the regulating wheel 24 is thus eliminated,

and the apparatus may thereupon function to grind successively work which is of uniform diameter or cylindrical throughout, as hereinbefore described, it being understood that such work may be continuously fed in the direction of the arrow 28aL of Figure 1' through the ap aratus. If, when the apparatus is thus a apted, it may be desired to eliminate f the reciprocating movement of the grinding wheel 22 relative to the work on the carrier 28, the clamping screw (see Figures 4 and 2) may be entirely removed, thus disconnecting the arm 64 from the arm 63. The former may thus freely oscillate in response to the crank-pin 49 without, however, transmitting its oscillating movement to the arm 63, which as hereinabove described, controls the movement of the grinding wheel 22 relative to the carrier 28 or the work thereon.

The regulating wheel 24, through the carriage 12, may be manually adjusted toward or away from the grinding wheel 22 by adjustably positioning the carriage 12 along the ways 14. In Figure 1 is shown a hand-wheel 76 rigidly connected to a shaft 77 preferably passing through the sleeve 67 and extending lengthwise of the apparatus. The shaft 77, which is housed within the main frame 10 is rotatably supported at its right hand end in a suitable bearing 78 mounted upon the interior of the main frame 10. The shaft 77, moreover, is held against axial movement thereof in any suitable manner. Adjacent its right hand end, the shaft 77 is threaded as at 7 7a so as to be in threaded engagement with an interiorly threaded bushing 79 detachably connectedto the carriage 12. Thus the bushing 79 is provided with an enlarged or headedl portion 7 9a at one end thereof and passes through a ybracket 80 secured in any suitable manner to the underside of the carriage 12.

The right hand end of the bushing 79 is exteriorly threaded and has in threaded engagement therewith a nut 79". The bushing 79 may thus be rigidly secured with respect L lto the bracket 80, the latter being clamped between the headed end 79a and the nut 7 9b of the bushing 79. Manual rotation of the shaft 77 by means of a hand-wheel 76 therefore causes a movement of the bushing 79 along the shaft 77, in a direction depending upon the direction in which the shaft 77 is rotated, and the bushing 79. beingin rigid connection with the carriage 12, moves the latter with it.

This manual adjustment ofthe carriage 12 and hence of the regulating wheel 24 toward or away from the grinding wheel 22 may be made for example when the adjustment of the position of the carriage 12 with respect to the cam 68 is made, or for adjusting the relation of the regulating wheel with respect to the,

carrier or the grinding wheel 22 when the withdrawing mechanism of the regulating wheel is disconnected. When the withdrawing mechanism of the regulating wheel 24 is 'made operative, the nut 79" of the bushing 79 is backed off as shown in Figure 1, so as to permit the cam member 68 to freely move the carriage 12, the-bushing 79 being thus released from rigid connection with the bracket 82 of the carriage 12. j

Referring now to Figures 1 and 2 there are generally indicated at 80 and 81 truing devices associated with the wheels 22 and 24 respectively and su ported upon the carriages 11 and 12 respectively. These mechanisms may take the form for example as is shown in my co-pending application Serial No. 619,373, filed February 16, 1923, andare adapted to traverse a truing tool, such as a diamond relative to the operative surfaces of the two wheels. In grinding work of tapered form, the truing mechanism 81 may be employed to give the regulating wheel 24 a tap'eredform or shape shown in somewhat exaggerated form at 24a in Figure 9, it being understood that this view is diagrammatic. 'Iheigrinding wheel 22 is preferably maintained in a true cylindrical form, and in Figure 9 is shown at 22a in dotted lines at the end of one of its strokes of movement.

The work, referring still to Figure 9, is

shown at 32a in the form of a tapered blank, and is supported upon the work carrier 28 with its one end abutting against the stop member 28", to` prevent the work from wedging itself betweeno the two Wheels. The work carrier-28, however, is positioned so that an element of the conical surface of the work piece 32n assumes substantial coincidence with the path of movement of the operative portion of the grinding wheel '22 relative to the work support itself. Thus, as is' shown diagrammatically in Figure 9, it will be seen that the work carrier 28 assumes a position ywhich maybe said to be substantially coincident with the bisector of the angle between the adjacent operative surfaces of the two wheels. The carrier 28 may be thus positioned as by pivotally mounting the carrier frame, as at 82, to be adjustably swung about a vertical pivot.

The carrier 28 is also inclined with respect to the horizontal plane and has its front end (adjacent the supporting post 30) of lower elevation than the rear end thereof (adjacent the post 30") As hereinbefore described the independent supporting posts 30a and 30" of the carrier 28 permit each end ofthe carrier 28 to be adjustably displaced and positioned in both the vertical and the horizontal plane. Thus it will be seen that the apparatus may be readily accommodated for operation upon work of tapered form, as is diagrammatically shown in Fi ure 9, it being understood that the action o the remaining parts of the apparatusI as hereinbefore in detail` described may be efficiently and effectively utilized 'when acting upon work of this character.

Reference Kto F1 re 9 shows also that with work of taper form, the grinding wheel 22 may be reciprocated beyond the ends of the work, where such action is desirableto insure more uniform wear of the inding wheel and hence the maintenance ora continued uniformity in its action.

It will thus be seen that there has been pro-vv vided by Athis invention a grinding apparatus and an art of` grinding in which the several objects hereinbefore pointed out as well as many thoroughly practical advantages are successfully achieved. It will be noted that the apparatus'is of practical and rugged construction throughout, is of great flexibility of action and operation and hence may be readily adapted to meet the various requirements of practical use. It will moreover be seen that the apparatus is of reliable and dependable action and moreover .it is substantially fool-proof., It may also be pointed out that there has been provided in this invention an apparatus capable of high s eed of production, and an art of grinding w ich may be carried on at high speed, all without impairmentof accuracy and uniformity in result.

Certain features I have disclosed and claimed more broadly in my co-pending application Serial No. 669,693, filed October 20, 1923.

. As manypossible embodiments may bemade of the mechanical features of the above inventionand as the art herein described might be varied in various parts all without departing from the scope of the invention, it is to be understood that all matter herein set `forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense. x

I claim as my invention:

l. In apparatus of the character described, in combination, a carrier adapted to support thereon work of round section, a grinding wheel rotatable at relatively high speed and positioned on one side of said carrier, a regulating wheel on the other side of said carrier, means includin a. shaft rotated at relatively low speedfor riving said regulating wheel to give the latter a slow surface speed, thereby to control the rotation of the work on said carrier, said wheels being adapted to present adjacent loperative surfaces traveling in op-a posite directions, means driven from said slow speed shaft for giving said grinding wheel a linear movement in the general direction in which said` work carrier extends, and means driven from said slow speed shaft for withdrawing one o-f said wheels from the other to release the work from the grip of said wheels.

2. In apparatus of the character described, in combination, a grinding wheel rotatable at relatively high speed, a regulating wheel,

means for holding a work piece of round section between said wheels, means including `a shaft rotated at relatively low speed for 'drivof said carrier and adapted ,to be rotated at relatively high speed, a regulating Wheel on the -other side of said carrier and adapted to to be rotated at relatively` low speed, said wheels being adapted to present adjacent operative surfaces traveling in opposite directions, and mechanism driven from said regulating wheel for withdrawing the regulating wheel from said grinding wheel to release the work therebetween.

4. In apparatus of the character described, in combination, a carrier adapted to support for free lateral movement thereon work of round section, a grinding wheel on one side of said carrier and adapted to be rotated at relatively high speed, a regulating wheel on the other side of said carrier and adapted to be rotated at relatively low speed, said Wheels being adapted to present adjacent operative surfaces traveling in opposite directions, means for predetermining the distance between the adjacent operative surfaces of said wheels to accommodate therebetween work of different diameter, automatic means for withdrawing one wheel from the other and from the work carrier to interpose between the withdrawn wheel and the work carrier a space through which the work may pass, and means for predetermining the extent ofthe withdrawing movement of the one wheel in order to accommodate said space to work of' different diameters.

5. In apparatus of the character described, in combination, a carrier adapted to support thereon work of round section, a grinding Wheel related to said carrier and rotatable at' relatively high speed, a regulating wheel related to said carrier and rotatable at relatively low speed and in a direction topresent an operativesurface traveling in a direction relative to that of the grinding wheel surface to said last-mentioned means to be operated in predetermined timed relation with respect, to

said means for reciprocating said grinding v wheel.

' I 6. In apparatus of the character describedb in combination, a carrier adapted to support thereon work of round section, a grinding wheel related to said carrier and rotatable at relatively high speed, a regulating wheel related to said carrierand rotatable at relameans for withdrawing one of said wheels fromthe other to release the work from the grip of said wheels.

7. In apparatus of the character described, in combination, a grinding wheel rotatable at relatively high speed, a regulating wheelv rotatable at relatively low speed and in a direction to present an operative surface traveling in a direction relative to that of said grinding wheel surface to control the rotation of round work during grinding action thereon by said grinding wheel, a carrier extending between said wheels for supporting thereon Work of round section, said carrier having a supporting surface in! clined toward said regulating wheel, and means for withdrawing one of said Wheels from the other to release the work from the gri ,of said wheels, said inclined surface of sai work carrier acting to cause the work when released to be urged toward said regulatin wheel and out of contact with said grin ing wheel.

8. In apparatus of the character described, in combination, a grinding wheel rotatable at relatively high speed, a regulating wheel rotatable at relatively low s eed, said wheels being adapted to present a jacent operative surfaces traveling in opposite directions` a carrier extending between said wheels for supporting thereon work of round section, said carrier hav' clined toward salii regulating wheel, the inclination of said supporting surface acting to increase the contact pressure between the work and said regulatin wheel durin normal action of said whee s on the wor acting to cause the work to roll toward the regulatinglwheel when released from the grip of said w eels, and means for withdrawing said regulating'wheel from said grinding wheel to release the work from the grip of said wheels.

9. In apparatus of the characterlescribed, in combination, a grinding wheel rotatable at relatively high d, a regulatin wheel' rotatable at relative y low speed, sai wheels being adapted to present a jacentcop'ecative surfaces traveling in opposite4 directions. a

a supporting surface -inand carrier extending between said wheels for supporting thereon work' of round section,

said carrier having a supporting surface inclined toward said regulating wheel, and automatic means for withdrawing said regulating wheel from said carrier sufficiently to permit the work to pass between said carrier and said regulatin wheel, the inclined supporting surface o said work carrier causing the work to roll oil' ofthe carrier.

10. In apparatus of the character described, in combination, a pair of abrasive wheels, means for holding work between and in operative relation to said wheels, power l actuated means for moving one wheel relative to the other, and means adapted to yield upon said power actuated means being overloaded.

11. In apparatus of the character described, in combination, a pair of abrasive wheels, means for holding work between and in operative relation to said wheels, power actuated means adapted in recurring sequence to withdraw one of saidfwheels from the other and t6 return said wheel to its initial'posil tion, and means adapted to yield upon said power actuated means being overloaded.

12. In apparatus of the` character described, in combination, `a pair of abrasive wheels,

means for holding therebetween work for 'action thereon by said wheels, ascarriage rotatably supporting one of said wheels and adapted to be moved relative to the other of said wheels, a cam member and a follower member, one of which is associated l with said carriage and the other of which is associated witha part which is fixed with respect to Said carriage for bringing about a movement of said carriage relative to said other wheel, and means yieldably mountin `one of said last mentioned members, sai

means being adapted to yield upon the resistance to movement of said carriage exceeding a predetermined extent,

13. In apparatus of the character described,

respect to said carriage for bringing aboutl a movement of said carriage relative to said Vother wheel,'and means yieldably mounting said follower member upon said fixed part and adapted to permit yielding of said follower member with respect to said ca m memi ber upon vthe resistance to movement of said carriage exceeding a predetermined extent. 14. In apparatus ofthe character described,

'in combination, a pair of abrasive wheels,

means for holding therebetween work for actionthereon by said wheels, a carriage rotatably supporting one of said 'wheels and adapted to be moved relative to the other of said wheels, a cam member and a. folllower member, one of which is associated with said carriage and the other of which is associated with a part which is fixed with respect to said carriage for bringing about a movementV of'said carriage relative to said other wheel, an arm supporting at one end thereof one of said members and pivotally supported at the other yend thereof` upon said iixed part, and yieldable means preventing movement of said arm about its pivotal support.

15. In apparatus of the character described, in combination, a pair of abrasive wheels, means for holding therebetween Workfor action thereon by said wheels, a carriage rotatably supporting one of said wheels and adapted to be moved relative -to the other of said Wheels, a cam member mounted upon said carriage, a follower member mounted upon a part'which is fixed. relative to said y carriage, and means for adjusting sa1d`cam member relative to said carriage to adjust the distance between said two wheels.

16. In apparatus of the character described,

in combination, va pair of abrasive wheels, means for holding therebetween work for action thereon by said wheels a carriage rotatably supporting one of said wheels and adapted to e moved :relative to the other of said wheels, a cam member mounted upon said carriage, a follower member mounted upon a part which is fixed relative to said carriage, and means for adjustably positioning said follower member to adjust the distance between said two wheels.

17. 'In apparatus of the character described, in combination a pair of abrasive wheels, means for holding therebetween work for action thereon by said wheels a carriage rotatably supporting one of said wheels and adapted to be moved relativeY to the-other of said wheels, means for movin said carriage relative to one of said w eels com- Erising a cam member and a follower memer, one of which is associated with said carriage and the other of which is associated with a part which is fixed with respect to said carriage, and means forming an operative connection betweeny said carriage .and its associated member including a lost motion connection.

18. In apparatus of theI character described,

in combination, a pair vof abrasive wheels,

means for holding therebetween work for action thereon by saidwheels, a carriageV rotatably supporting one of said wheels and adapted to be moved relative t6 the other, of -said wheels, a rotatable shaft carried.

by said movable carriage, a camv member rotatable with but slidable with respect to said shaft, a follower member' associated Nsitioning sai I 19. In apparatus of-the character described,

-in combination, a carrier ada with a part which is fixed with respect to said carriage and means for adjusta ly pocam member along said shaft.'

in combination, a pair of abrasive wheels, means for holding therebetween work for action thereon by said wheels, a carriage rotatably Su vporting one of said wheels and adapted to e vmoved relative to the other of said wheels, a rotatable shaft carried by said movable carri e, a cam member rotatable with but slida le with respect to said shaft, a follower member associated with to the other, means for adjusting said one wheel toward or away from the other, and means for making inoperative one of Said last mentioned means ther eby to permit operation of the other.

21. In apparatus of the character described,

d to support for free lateral movement ereon work ofround section, an abrasive wheel on one side of said'carrier for action upon the work thereon, a second abrasive wheel on the other side of said carrier for actiony on the work thereon, said wheels being adapted to effect simultaneous rotation and grinding of work on said carrier and to effect a feeding movement thereof lengthwise of said carrier, means for limitin movement of the work lenglthwise of sai carrier, and means for wit drawin other to re ease the work therebetween.

l22. In apparatus of the character described, in combination, a carrier adapted to one of vsaid wheels from the one side of said carrier for action u on the work thereon, a second abrasive whee on the,

lother side of said carrier for action on the work thereon, means for givin one of said thel work lengthwise of said carrier during action thereon by said wheels, and means for withdrawing one of said wheels from the' other to release the work therebetween.

23. In apparatus of -the character 'described, in, combination, a grindin wheel adapted to be rotated at relativel hig speed, a regulating wheel adapted to rotated at relatively low speed, said wheelsbeing rotated to present adjacent operative surfaces traveling in opposite directions, means for holding work-o round section between said wheels for grinding action thereon by said grinding wheel and rotating action thereon by said regulating wheel, means for giving said grinding wheel a linear movement lengthwise of said carrer,'means for preventing movement of the work lengthwise of said carrier during movement of said grinding wheel,and means orwithdrawing one of said wheels from the other to release the Work therebetween;

24. In apparatus of the character described, in combination, a grinding wheel adapted to be rotated at relatively high speed, a regulating wheel adapted vto be rotated at relatively low speed, said wheels being rotated to present adjacent operative surfaces traveling in opposite directions, means for holding work of round section between said Wheels for grinding action thereon by said grinding wheel and rotating action thereon by said regulating wheel, a stop positioned in the path o f travel of work along said workholding means, the path of travel of thc operative surface of said regulating wheel being 'inclined with respect to the path ot' .travel of the work along said carrier, thereby to hold the work against said stop, Aand means for withdrawing one of said wheels from the other to release the work therebetween,

25. In apparatus of the character described, in combination, a grinding, wheel adapted to be rotated at relatively high speed, a regulating wheel adapted to be rotated at relatively' low speed, said wheels being roscribed, yin combination, a pair of wheelsadaptedfor simultaneous grinding. and rotating action u on work of round section in-l to said wheels, a slide supporting one of said.

tated to present adjacent operative surfaces traveling in opposite directions, means for holding work round section between said wheels for grinding action thereon by said grinding wheel and rotating action thereon by saidgregulating wheel, a stop` positioned in the path of travel of work along said workholding means, thev path of travel of the operative surface of-said regulatingrwheel being inclined with respect to the path of travel of the w'ork along said carrier, thereby to hold the work against said stop, means for giving said grinding wheel a reciprocating movement relative to the work, and means for withdrawing one of said wheels from the other to release the work therebetween.

26. In apparatus of the character deterposed there tween,.means for holding work of round section inoperative relation wheels for movement toward or away 'from the other, power -actuated means for movin said slide, additional means for movln sai slide, one of said means acting upon sai slide through a releasable member.

27. In apparatus of the character described, in combination, a pair of wheels adapted for simultanenous'grindin and rotating 4action upon work of roun section interposed therebetween, means for holding Work of round section in operative relation to saidwheels, a slide supporting one of said wheels for movement toward or away from the other, power actuated means for moving said slide, additional means for moving said slide, and means forming a detachable connection between eachof said means and said slide'.l

28. In apparatus of the character described, in combination, a grinding throat adapted for simultaneous grinding and rotating action upon work of round section and including three members, one of which members is in the -form of a grinding Wheel adapted to be rotated at a. relatively high speed,

another of said members being in the form of l a regulating wheel adapted to be rot-ated at a relatively low speed and in a direction to present an operative surface traveling in a direction opposite'from that of the adjacent grinding wheel surface, and the third of which members .includes a member for hold` scribed, in combination, a grinding throatV adapted for simultaneous grinding and rotating action upon work of round section and including three members, one of which members is in the form of a grinding wheel adapted to be rotated at a relatively high speed, another of said members beingin the form of a regulating wheel adapted to be rotated at a relatively low speed and in a direction to present an operative surface traveling in a direction opposite from that of the adjacent grinding wheel surface, and

the third of which members includes a member for holding work of round section in operative relation to said two wheels; supporting means for one of said members adapted to ermit movement thereof toward or away rom one of the remaining members; power actuated means for moving said supporting means; manual means for moving said supporting means, and means forming a detac able connection between one of said movingnmeans and said supporting means.

30. apparatus of the' character described in combination, a grinding throat adapted for simultaneous grinding and rotating act-ion upon work of round section and including three members, one of which members is in the form of a grinding wheel adaptedto be rotated at a relatively hi h speed, another of said members being in t e form of a regulating wheel adapted to be lll \ direction to resent anl operative surface travfor holding workY of round section in operaeling in a 'rection opposite from that of the adjacent grindingewheel surface, and the third of which mem rs' includes .a member the work, a grinding wheel positioned on one ing operation upon' said work, means vfor movin said'gyrinding wheel longitudinally of sai carrier, and means for simultaneousl controlling the rotation of said work on said tive relation to said twowheels, supporting carrier and holding said work against said means for one of said members adapted to permit movement thereof `toward or away rom oney of the remaining members; power actuated means for moving said supporting means; manual means for moving said s upporting means, a detachable connection between said power actuated means and said supporting means, and a detachable connection between said manual means and said supporting means.

31.- In a centerless grinder the combination of a work support having anend stop to position the work; a grindin wheel arran ed to shift back and forth in t e direction' o Aits axis during the grinding operation; and a regulatin wheel skewed to exert on the work an axial ceding tendency in the direction of said end stop.

32. In apparatus of the character described, Y

in combination, a grinding wheeladapted to be rotated at a relatively high speed, a regulating wheel adapted tobe rotated' at a re1- atively low speed, said regulating being rotated to present an operative surface traveling relative to that of said grinding wheel to control the i'otation of round work, a carrier for supporting work of round section in operative relation to the operative surface of said wheels, means for 'ving said grinding wheel a movement in t e eneral direction in which said carrier exten and means for limiting the movement of the work along-said carrier whereby movement of said grinding wheel is prevented from moving the work lengthwise of said carrier.

33. In apparatus of the character described, in combination, acarrier for supporting thereon work o f round section, a grinding wheel positionedon one sideof said carrier and rotatable at a relatively high speed, thereby to perform a ding operattionupon said work, a re ating wheel positioned on the other side-of said carrier and rotatable at a relatively low speed, thereby to control the rotation of said work on said carrier, means for-giving said din wheel a linear movement relative to t e wor and a stop for engaging the .work on said carrier the path of travel of the opera ve surface o Qctober, 1923.

v j LEW'ISR. HEIM.

-side of said lcarrier for performing a grindsaid regulating wheel being `inclined with respect to the path of travel of the work on said carrier, whereby said regulating wheel is effective to hold said work againstsaidstop during the travel of said grinding wheel.

34. In apparatus of the character described, in combination, a carrier forsup# portin thereon work of round section, and provi ed with a' stop for engagement with 

